rcc structures design Mcqs
101. Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at________________?
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A. Supports

B. Quarter span

C. Every section

D. Mid span
102. For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is_______________?
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A. wl/4

B. wl/12

C. wl/8

D. wl/16
103. If the modular ratio is , steel ratio is and overall depth of a beam is , the depth of the critical neutral axis of the beam, is___________________?
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A. [m/(m + r)] d

B. [(r m)/m] d

C. [(m + r)/ m] d

D. [m/(m r)] d

104. The shear reinforcement in R.C.C. is provided to resist__________________?
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A. Diagonal compression

B. Horizontal shear

C. Vertical shear

D. Diagonal tension
105. Dimensions of a beam need be changed if the shear stress is more than_______________?
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A. 20 kg/cm2

B. 10 kg/cm2

C. 15 kg/cm2

D. 25 kg/cm2

106. The maximum ratio of span to depth of a cantilever slab, is_______________?
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A. 8

B. 16

C. 12

D. 10

107. For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is___________________?
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A. 3

B. 1

C. 2

D. 5

108. A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds_________________?
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A. 25

B. 10

C. 20

D. 15
109. If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than____________________?
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A. 6 mm

B. 5 mm

C. 4 mm

D. 8 mm

110. The advantage of a concrete pile over a timber pile, is_______________?
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A. No decay due to termites

111. bending moment of a simply supported slab is M Kg.cm, the effective depth of the If the maximum slab is (where Q is M.R. factor)________________?
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A. M/100Q

B. M/ Q

C. M/Q)

D. (M/100Q)
112. If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be________________?
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A. 8hp/ l

B. 8hl/p

C. 8hl/p

D. 8hp/l
113. If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is_____________?
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A. 10 mm

B. 14 mm

C. 12 mm

D. 16 mm
114. In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are______________?
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A. 12 legged

B. 8 legged

C. 6 legged

D. 10 legged

115. If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment____________________?
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A. WL/6

B. WL/2

C. WL/8

D. WL/4

116. is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is_________________?
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A. f = (P/A) + (M/6Z)

B. f = (P/A) + (Z/M)

C. f = (A/P) + (M/Z)

D. f = (P/A) + (M/Z)
117. Pick up the true statement from the following?
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A. In the absence of beams, it is easier to install piping

B. All the above

C. In the absence of beams, it is easier to paint

D. Plain ceiling provides the best property diffusing light

118. For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed________________?
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A. 10

B. 20

C. 15

D. 25

119. The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or____________________?
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A. 18 bar diameters

B. 24 bar diameters

C. 12 bar diameters

D. 30 bar diameters

120. The maximum shear stress (q) in concrete of a reinforced cement concrete beam is_____________?
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A. Width/(Lever arm Shear force)

B. Lever arm/(Shear force Width)

C. Shear force/(Lever arm Width)

D. (Shear force Width)/Lever arm

121. The maximum shear stress (qmax) in a rectangular beam is_______________?
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A. 2.0 times the average

B. 1.75 times the average

C. 1.50 times the average

D. 1.25 times the average

122. For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to______________?
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A. 15

B. 10

C. 20

D. 25

123. In a singly reinforced beam____________?
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A. Steel possesses initial stresses when embedded in concrete

B. Plane sections transverse to the centre line of the beam before bending remain plane after bending

C. Compression is borne entirely by concrete

D. Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

124. In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength______________?
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A. 200 kg/cm2

B. 300 kg/cm2

C. 100 kg/cm2

D. 400 kg/cm2
125. A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, is_________________?
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A. 30 cm

B. 35 cm

C. 25 cm

D. 20 cm

126. Distribution reinforcement in a simply supported slab, is provided to distribute_______________?
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A. Load

B. Temperature stress

C. All the above

D. Shrinkage stress

127. Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as__________________?
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A. 1/16th of the span

B. 1/10th of the span

C. 1/8th of the span

D. 1/12th of the span
128. A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis______________?
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A. Remains within the flange

B. None of these

C. Remains below the slab

D. Coincides the geometrical centre of the beam

129. For a number of columns constructed in a rcjw, the type of foundation provided, is_______________?
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A. Strip

B. Raft

C. Footing

D. Strap

130. The length of the straight portion of a bar beyond the end of the hook, should be at least_______________?
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A. Seven times the diameter

B. Twice the diameter

C. Thrice the diameter

D. Four times the diameter

131. If the depth of actual neutral axis of a doubly reinforced beam______________?
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A. All the above

B. Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier

C. Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier

D. Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously

132. An under-reinforced section means_________________?
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A. Steel provided is insufficient

B. Steel is provided at the underside only

C. Steel provided on one face only

D. Steel will yield first
133. The steel generally used in R.C.C. work, is_________________?
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A. Stainless

B. High tension steel

C. High carbon steel

D. Mild steel
134. In a combined footing if shear stress does not exceed 5 kg/cm2, the nominal stirrups provided are________________?
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A. 6 legged

B. 8 legged

C. 12 legged

D. 10 legged

135. The minimum number of main steel bars provided in R.C.C________________?
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A. All the above

B. Circular columns is 6

C. Rectangular columns is 4

D. Octagonal columns is 8

136. A short column 20 cm 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm2 and 300 kg/cm2, the Safe load on the column, should not exceed_______________?
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A. 4120 kg

B. 412,000 kg

C. None of these

D. 41,200 kg
137. According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is_____________?
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A. 10 kg/cm 2

B. 20 kg/cm2

C. 5 kg/cm2

D. 15 kg/cm2

138. Pick up the assumption for the design of a pre-stressed concrete member from the following_______________?
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A. All the above

B. Variation of stress in reinforcement due to changes in external loading is negligible

C. A transverse plane section remains a plane after bending

D. During deformation limits, Hooks law is equally applicable to concrete as well as to steel

139. Steel beam theory is used for_______________?
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A. Beams if shear exceeds 4 times allowable shear stress

B. Design of simple steel beams

C. Doubly reinforced beams ignoring compressive stress in concrete

D. Steel beams encased in concrete

140. The angle of repose of a soil is the maximum angle which the outer face of the soil mass makes_______________?
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A. With the vertical

B. With the horizontal

C. With the perpendicular to the inclined plane of the soil

D. None of these

141. An R.C.C. column is treated as short column if its slenderness ratio is less than_______________?
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A. 40

B. 30

C. 50

D. 35

142. If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm2, the length of the beam having nominal reinforcement, is________________?
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A. 8 cm

B. 6 m

C. 10 m

D. 8 m
143. The width of the flange of a T-beam should be less than_________________?
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A. Least of the above

B. One- third of the effective span of the T -beam

C. Breadth of the rib plus twelve times the thickness of the slab

D. Distance between the centres of T-beam

144. The system in which high tensile alloy steel bars (silica manganese steel) are used as prestressing tendons, is known as________________?
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A. Lee-McCall system

B. Freyssinet system

C. Magnel-Blaton system

D. C.C.L. standard system

145. A ribbed slab is provided for______________?
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A. A plain ceiling

B. Acoustic insulation

C. Thermal insulation

D. All the above
146. Pick up the incorrect statement from the following?
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A. In the stem of a retaining wall, reinforcement is provided near the earth side

B. None of these

C. In the toe slab of a retaining wall, reinforcement is provided at the bottom of the slab

D. In the heel slab of a retaining wall, reinforcement is provided at the top of the slab

147. In a singly reinforced beam, the effective depth is measured from its compression edge to_________________?
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A. Tensile edge

B. Tensile reinforcement

C. Longitudinal central axis

D. Neutral axis of the beam

148. If the maximum shear stress at the end of a simply supported R.C.C. beam of 6 m effective span is 10 kg/cm2, the share stirrups are provided for a distance from either end where, is________________?
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A. 150 cm

B. 50 cm

C. 200 cm

D. 100 cm

149. The angle of internal friction of soil mass is the angle whose_______________?
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A. Sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

B. None of these

C. Cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane

D. Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
150. The diameter of longitudinal bars of a column should never be less than_____________?
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A. 12 mm

B. 8 mm

C. 10 mm

D. 6 mm